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Zr alloy protection against high-temperature oxidation: Coating by a double-layered structure with active and passive functional properties

The result's identifiers

  • Result code in IS VaVaI

    <a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F20%3AN0000009" target="_blank" >RIV/26722445:_____/20:N0000009 - isvavai.cz</a>

  • Alternative codes found

    RIV/68378271:_____/20:00540178 RIV/68407700:21340/20:00347357 RIV/68407700:21730/20:00347357 RIV/60461373:22320/20:43920732

  • Result on the web

    <a href="https://www.sciencedirect.com/science/article/pii/S0010938X19316646" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0010938X19316646</a>

  • DOI - Digital Object Identifier

    <a href="http://dx.doi.org/10.1016/j.corsci.2019.108270" target="_blank" >10.1016/j.corsci.2019.108270</a>

Alternative languages

  • Result language

    angličtina

  • Original language name

    Zr alloy protection against high-temperature oxidation: Coating by a double-layered structure with active and passive functional properties

  • Original language description

    In this work, a new concept of metal surface protection against degradation caused by high-temperature oxidation in water environment is presented. We were the first to create a double-layered coating consisting of an active and passive part to protect Zr alloy surface against high-temperature oxidation in a hot water environment. We investigated the hot steam corrosion of ZIRLO fuel cladding coated with a double layer consisting of 500 run nanocrystalline diamond (NCD) as the bottom layer and 2 gm chromium-aluminum-silicon nitride (CrAlSiN) as the upper layer. Coated and uncoated ZIRLO samples were exposed for 4 days at 400 degrees C in an autoclave and for 60 min at 1000 degrees C (nuclear reactor accident temperature) in a hot steam furnace. We have shown that the NCD coating protects the Zr alloy surface against oxidation in an active way: carbon from NCD layer enters the Zr alloy surface and, by changing the physical and chemical properties of the Zr cladding tube surface, limits the Zr oxidation process. In contrast, the passive CrAlSiN coating prevents the Zr cladding tube surface from coming into physical contact with the hot steam. The advantages of the double layer were demonstrated, particularly in terms of hot (accident-temperature) oxidation kinetics: in the initial stage, CrAlSiN layer with low number of defects acts as an impermeable barrier. But after a longer time (more than 20 min) the protection by more cracked CrAlSiN decreases. At the same time, the carbon from NCD strongly penetrates the Zr cladding surface and worsen conditions for Zr oxidation. For the double-layer coating, the underlying NCD layer mitigates thermal expansion, reducing cracks and defects in upper layer CrAlSiN.

  • Czech name

  • Czech description

Classification

  • Type

    J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database

  • CEP classification

  • OECD FORD branch

    20500 - Materials engineering

Result continuities

  • Project

    Result was created during the realization of more than one project. More information in the Projects tab.

  • Continuities

    P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Others

  • Publication year

    2020

  • Confidentiality

    S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Data specific for result type

  • Name of the periodical

    Corrosion Science

  • ISSN

    0010-938X

  • e-ISSN

    1879-0496

  • Volume of the periodical

    163

  • Issue of the periodical within the volume

    February

  • Country of publishing house

    GB - UNITED KINGDOM

  • Number of pages

    22

  • Pages from-to

    1-22

  • UT code for WoS article

    000513295700038

  • EID of the result in the Scopus database

    2-s2.0-85076047855